May is National Home Improvement Month, but with so many home projects to tackle, where do you start? According to Mark Clement, a professional contractor and host of MyFixitUpLife home improvement radio show, there is a “must do” list of six exterior home features that homeowners should review every year .

Here is one of Clement’s “must do” tips:

Spend time with your doors. If you can see light around a door from the inside, your door is hard to close or lock, or the door itself is warped, it’s time to consider a new door. Even if you can’t see light, air may be moving through gaps in the weather stripping at a surprising rate.

Think about the weather conditions that your home’s doors face along with your energy bills. If either run to the extreme, consider replacing an inefficient entryway with a high-performance fiberglass door (which can have up to four times more insulation value than wood doors).